Articles
CHANGES IN ENDOGENOUS GROWTH SUBSTANCES COFACTORS AND METABOLITES IN THE ROOTING OF MANGO CUTTINGS
Seedlings and mature stock plants of mango cv.Langra were sprayed with ethrel, calcium carbide at 200 ppm and cuttings were taken after 7 days from treatment.
IBA at 3000 ppm was applied on cuttings from pretreated and untreated stock plants and they were planted in washed sand under intermittent mist.
Cuttings from mature clones failed to produce root while 40 to 90 percent cuttings from seedlings rooted, depending on the treatment.
IBA proved more effective than ethrel and calcium carbide and a combination of IBA and ethrel further stimulated root formation.
Although the variation in the endogenous ethylene concentration in the seedling and clonal cutting was not very pronounced before treatment, a marked rise in ethylene was recorded in seedling cutting.
Soluble and protein nitrogen showed a much increase in the seedling cutting compared to clonal cutting.
No growth promoting substances were found to be present in clonal cuttings while those from seedling contained growth promoter between Rf 0.1 and 0.3 when treated with calcium carbide and IBA, a high concentration of growth promoter was recorded in the bound fraction of ethrel treated cutting.
The seedling cuttings also contained root promoting substances under the different treatments including control and a higher concentration was found in the IBA treated cuttings.
The cuttings from mature clones did not show any appreciable endogenous root promoting activity in any of the treatments.
Presence of p- coumaric acid and ferulic acid was very conspicuous in the extract from seedling cutting.